
public class Null extends Atom {
	public Null() {
		super(null);
	}
	
	@Override
	public boolean isList() {
		return true;
	}

	@Override
	public boolean isNull() {
		return true;
	}

	@Override
	public boolean isPair() {
		return false;
	}

	@Override
	public String toString() {
		return "()";
	}

}
